\chapter{解三角形}

\section{三角函数}
\input{units/czds4-ch15-subsec1}
\input{units/czds4-ch15-subsec2}
\input{units/czds4-ch15-subsec3}
\input{units/czds4-ch15-xiti9}

\section{解直角三角形}
\input{units/czds4-ch15-subsec4}
\input{units/czds4-ch15-subsec5}
\input{units/czds4-ch15-subsec6}
\input{units/czds4-ch15-xiti10}

\section{解斜三角形}
\input{units/czds4-ch15-subsec7}
\input{units/czds4-ch15-subsec8}
\input{units/czds4-ch15-subsec9}
\input{units/czds4-ch15-subsec10}
\input{units/czds4-ch15-xiti11}

\input{units/czds4-ch15-xiaojie}
\input{units/czds4-ch15-fuxi}

